Improvement in sheet-metal dies



E. W. BLISS.

sum-METAL nms. N.175,653. v mmm April 4,1878.

'LUNITED STA'I'ES PATENT OFFICE,

ELIPHALET W. BLISS, OF BROOKLYN, NEW YORK.

IM'PROVEMENT IN SH EET-'METAL DIES.

Specification forming part of Letters Patent N0- l75,653, dated April 4, 1876; application file February 16, 1876.

To all whom it may concern Be it known that I, ELIPHALET W. BLISS, ot'v the city ot' Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Presses for Oupping Metal Blanks; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, which forms part of this specification.

This invention relates to presses for cupping metal blanks of various kinds and for different purposes-as, for instance, for making the llds and ends of metal cans or boxes.

The invention consists in novel means or combinations of means connected with the male or that die of the press which has an inserted ring that yields to the action of the other die, and operates as a follower ordischarger within it, whereby increased facilities are afforded for changing said ring to adapt the die to cupped work of different depths, and for substituting larger and smaller dies without changing the spring-pressure devices that act upon the ring.

Figure 1 represents a Vertical section of a press having `1ny invention applied. Figs2, 3, and 4 represent sectional views of the dies, upon a larger seale, at difl'erent stages in the prosecntion of the work.

A represents the one side, and B the bed, ot' a press for cupping metal blanks. O is the driving-shaft, forined with a crank or eccentric pin, b, that serves, as the shaft is revolved, to give backward-and-tbrward, or u p-and-down, motion to a die sliding holder, D, which contains the upper or female die E of the press. This die and the lower or male and stationary die G are constructed to make a sheetmetal cup, 12, as shown in Fig. 4, said cup or cupped blank being made by the female or working die E first coming down on a plain blank, l, as in Fig. 2, and afterward bending or turning down the edges of said blank by the female die entering within or over the male' die G against the resistance of a yielding ring, H, within the latter, thereby par- 'tially cupping the blank, asshown at I1 in Fig. 3, and suhsequently, by the continued like `motion of the ,upper die, completing the cupping of the blank, as at 12, Fig. 4.

The ring H forms a yielding base for the edges of the plain blank, and lies flush with the top surface of the lower die before the upper die comes down to bend over the edges of the blank. Said ring freely fits a cavity, o, in the lower or stationary die G, and rests at its back on loose pins d, which pass through said die, and bear on or against an enlarged head or disk, e, of a spring-plunger, I, which is fitted to work freely through the bed B, and

within a tube, K, containing a spring, f. This spring, which may be a spiral one, serves, when in its normal condition, to simply support the plunger, so that the ring H is flush with the top of the die G before the upper die commences to bend over the edges of the blank as against the resistance presented by the yielding ring. Diferent thicknesses ofmetal blanks, or diiferent depths of cups produced from said blanks, require different degrees of resistance to be presented by said ring, which also acts as a discharge or follower after the work has been done. To meet this requirement the tube K is provided at its lower end with an adjustable screw-plug, g,

upon which the one end of the spring rests. i

Fnrthermore, the plunger I has a screw-shank, h, passing loosely downA through the adjustable spring-support or screw-plug g, and capable of adjustinentby nuts ifroin below said plug, whereby the support of the ring H in relation to the top of the die G may be regulated to suit different thicknesses ot' die, and difi'erent resistances of the ring, as controlled by the adjustment of the plug or support g on the springf. Again, the plunger I or its head e is of such enlarged area relatively to the distance apart of the ring-supporting pins do that the same head or plunger will serve as a base for carrying rings H of difi'erent sizes or diamete'rs, accordingly as smaller or larger dies E and G are used to make cupped blanks of varying area or size, and the changing of `the die G in 110 Way necessitates any removal of the plunger I, or the means by which said plunger is supported and adjusted.

I claim- The combination, with the die Gr and its yielding ring H,.of the pins d, the discounected plunger I, the spring-tube K, the spring and the adjustable plug or spring support g, substantially as specified.

ELIPHALET W. BLISS.

Witnesses MENzo DIEFENDORF, KENT J ARVIs. 

